15. What contributes most to acid precipitation?
a. burning of fossil fuels
b. formaldehyde
c. radon
d. all of the above

What provides structure to the human body?

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit